More awful MPGs

[Marks DTM Calib]

Start with the basics.

1) The engine is getting upto temp?
2) The airfilter is clean

[The Barge Captain]

My Missus has got my Omega's average down to 23 mpg commuting for an average of 30 minutes over 6 miles each way to work!
(2.5 manual)

[bob.dent]

Seems very excessive for a 2.0 James. I normally get between 25-27 mpg urban/town and 31-32 mpg on motorway/long run from my 2.5 V6 estate, although it is manual.

[JamesV6CDX]

Start with the basics.

1) The engine is getting upto temp?
2) The airfilter is clean

Airfilter was renewed when I got the car a couple of weeks ago

As far as getting up to temp goes, it's hard to tell, because the temp gauge only works when it feels like it  

[TheBoy]

I wonder if the wrong washers have been used on coolant bridge, causing bad earth....  ....iirc, the ecu is too old so cannot tech2 it...

[JamesV6CDX]

I wonder if the wrong washers have been used on coolant bridge, causing bad earth....  ....iirc, the ecu is too old so cannot tech2 it...

You are right about the ECU

Interestingly, I filled it to the top again last night, still on Tesco99. I since did a run home, about 7 miles in heavy stop/start traffic, and 65 miles on the Motorway between 70-80mph..  

When I got back to Gloucs I filled up with Tesco99 again, and it cost me exactly £7.70 to do 72.2 miles, which is 37.7mpg.. (MID said 38.5).. these are closer to the figures I would expect....

Weird!!!

[theolodian]

To expand on TB's comments, check your ground connections?  Block, engine loom, etc.

[Kevin Wood]

When I got back to Gloucs I filled up with Tesco99 again, and it cost me exactly £7.70 to do 72.2 miles, which is 37.7mpg.. (MID said 38.5).. these are closer to the figures I would expect....

Weird!!!

I wonder if you got a dose of the contaminated fuel as well? Didn't make such a dramatic difference to fuel consumption on my car but on a different engine management system it might have. In fact, as yours didn't throw up a fault light maybe it indicates that the limits are wider and it carried on winding the correction up rather than going back to base values and barfing a fault code?

Guess we'll never know.

Kevin

[JamesV6CDX]

When I got back to Gloucs I filled up with Tesco99 again, and it cost me exactly £7.70 to do 72.2 miles, which is 37.7mpg.. (MID said 38.5).. these are closer to the figures I would expect....

Weird!!!

I wonder if you got a dose of the contaminated fuel as well? Didn't make such a dramatic difference to fuel consumption on my car but on a different engine management system it might have. In fact, as yours didn't throw up a fault light maybe it indicates that the limits are wider and it carried on winding the correction up rather than going back to base values and barfing a fault code?

Guess we'll never know.

Kevin

Who knows... I'm going to run this tank to the bottom.. and it's going to be OPTIMAX from then on!

[JamesV6CDX]

That is.. until I'm running on LPG

[paolo]

my 3.0 elite gets 17 to 18 locally..lots of hills, short journeys....on a run, it can really rise....it loves motorway journeys, with cruise control, and gets to around 29 mpg

[JamesV6CDX]

my 3.0 elite gets 17 to 18 locally..lots of hills, short journeys....on a run, it can really rise....it loves motorway journeys, with cruise control, and gets to around 29 mpg

On a steady motorway run, I'd want more than 29........

[TheBoy]

my 3.0 elite gets 17 to 18 locally..lots of hills, short journeys....on a run, it can really rise....it loves motorway journeys, with cruise control, and gets to around 29 mpg

On a steady motorway run, I'd want more than 29........

My 3.0l on a steady motorway run is low 30s.  Apparently, on run, Inst Cons should be reading low 40s at 70mph on 2.0l

[Martin_1962]

my 3.0 elite gets 17 to 18 locally..lots of hills, short journeys....on a run, it can really rise....it loves motorway journeys, with cruise control, and gets to around 29 mpg

On a steady motorway run, I'd want more than 29........

My 3.0l on a steady motorway run is low 30s.  Apparently, on run, Inst Cons should be reading low 40s at 70mph on 2.0l

Apart from not going that slow I rarely got over 40 instant on mine except on overrun.

The 2.0s aren't THAT economical. BEtter than V6s but not hugely better

[JamesV6CDX]

my 2.0 Gets 36mpg on a run, and about 22mpg knocking around.. big difference...